linux-kernel - Re: [RFC 0/3] Recursive reclaim (on __PF

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Message-ID: <Pine.LNX.4.64.0709121537190.4067@schroedinger.engr.sgi.com>
Date:	Wed, 12 Sep 2007 15:39:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	dkegel@...gle.com, David Miller <davem@...emloft.net>,
	Daniel Phillips <phillips@...gle.com>
Subject: Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC)

On Tue, 21 Aug 2007, Nick Piggin wrote:

> The thing I don't much like about your patches is the addition of more
> of these global reserve type things in the allocators. They kind of
> suck (not your code, just the concept of them in general -- ie. including
> the PF_MEMALLOC reserve). I'd like to eventually reach a model where
> reclaimable memory from a given subsystem is always backed by enough
> resources to be able to reclaim it. What stopped you from going that
> route with the network subsystem? (too much churn, or something
> fundamental?)

That sounds very right aside from the global reserve. A given subsystem 
may exist in multiple instances and serve sub partitions of the system.
F.e. there may be a network card on node 5 and a job running on nodes 3-7
and another netwwork card on node 15 with the corresponding nodes 13-17 
doing I/O through it.
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